A Sister of the Stars

by PrincessLuna88

The Alicorn in the Library

Rainbow Dash didn't even bother to open the door. At the speed she was traveling, she wasn't even sure she could. Instead she decided to blast a giant hole in Twilight's front door, "I'll fix it later!" She yelled back to Starlight who seemed aghast that Dash would break such an ancient and powerful relic. "Too late, I guess." Dash snickered to herself.
The door splintered and shot into the library and flew until it was stopped by a pile of old books and a grumpy unicorn. The door (or what was left of it) was engulfed in a purple glow and levitated over to a nearby wall where it rested and started to mend itself.
"Dash," Twilight scolded, giving her an evil glare over the top of her books "that was a nice door, and now I'm going to have to spend this whole weekend trying to fix it." Twi gave her the best pouty face she could conjure up, but Dash wasn't having any of it.
"Twi, you need to see this." Dash stepped aside and pushed the timid alicorn forward until Twilight could see her.
"Rainbow, I don't have time for this! I tried helping Pinkie last week with the foals and I was terrible. You can't keep coming up to me with things you are too lazy to do. Unless you have a genuine concern, I am in the middle of an interesting text on levitation and its effect on psychology." Twilight sighed and put her head back in her book, trying her absolute hardest to ignore the rambling pony in the middle of the room.
"But Twiiiiii," Dash complained, stamping her foot exasperatedly. "She's an alicorn." Starlight smiled sheepishly and hid her head in her hooves.
"I am dreadfully sorry to cause you any inconvenience Ms. Twilight, but Rainbow Dash told me that I needed to see you and it is true, and, apparently, I'm an alicorn." Starlight seemed to whisper but the sound echoed through the room. The little filly sat on the floor and began pulling on her mane, stroking it with her magic. Her wings spread out and tightened around her body, the primary feathers meshing and becoming a solid wall of sparkling dawn.
"An alicorn!" The unicorn shot up and was up in front of the filly in no time. A purple aura surrounded Starlight as she was pulled up into the air and examined fully. The long wings extended and each feather was meticulously shuffled through, the tickling causing Starlight to giggle uncontrollably. The flowing mane was brushed and Twilight seemed astonished at the glittery residue it left on her hoof after she had stroked it. She whipped out a measuring tape and measured her legs and her horn. Then, of course, she wrote a list:

Extra-long wings: colors spread from white to orange to black like a sunset, and they almost seemed to be made of flame, each other wings curling in and causing spiraling colors.
Mane and Tail: Same color scheme as wings but ended in a darker black, both sparkled and glittered and were constantly flowing. Tried to watch one star in the tail but each movement caused them to change and flow, very tantalizing.
Horn: 2 inches longer than my own, even in a foal the horn is longer. When she used magic the colors fluxuate slightly and leaves a residue of what seems like glitter. (Pure magic, perhaps?)

"I can't believe it! We need to tell Princess Celestia immediately!" Twilight began panicking and grabbing as many things as possible, shoving them into her saddle bags. "Spike, get down here and take a letter!!" She ordered.

While this was going on Starlight turned to Dash and whispered, "Sissy's here?" Her eyes were full of excitement and sparkled nearly as much as her mane.

"Don't know, she might be.” Dash said, not really paying much attention as she watched Spike start to shuffle drearily down the stairs only to be bombarded by a pile of books and a stack of paper. The poor assistant went tumbling down the stairs, paper flying, and tail whirring until he bounced off the bottom step. Suddenly, the little dragon was engulfed in an orange glow the straightened his scales and collected all of the things that had been dropped, depositing them into his claws and released him gently onto the floor. Twilight whipped around and stared at the filly whose horn was starting to fade but the glitter in the air around her gave it away.

"Wait-what-how?" Twilight for once was at a loss for words. "That is advanced levitation. Who taught you that?" The lavender unicorn was staring at the filly, her mouth wide open in astonishment.

"Well, I w-was trying to tell Rainbow Dash, but then Spike fell and you mentioned Celly and, and it all happened so fast. You hate me now, don't you?!" Starlight stammered and then burst into tears. Twilight rushed forward to embrace the filly, but Starlight turned away and shied away from the lavender unicorn. "Stop! Don't come any closer! Please, I don't want to hurt you!" Starlight's horn lit up and a bubble of light appeared on the tip. The bubble expanded and grew, grew until it engulfed her in what appeared to be a miniature sun. Her faint outline could be seen inside but the light blinded the two ponies as they scrambled backwards.

" Twilight! What’s going on?!" Dash yelled, flailing her hooves, trying to cover her eyes.

“It seems that she's bending the spectrum in her vicinity, creating an impenetrable fortress. Incredible! I only learned about such a thing in the Starswirl the Bearded wing last month!"

Rainbow Dash shook her head. Even in the face of probably the most dangerous filly ever to set foot in Equestria, besides the royal sisters of course, Twilight could still hold a decent lecture.
"In English, please?"

Twilight deadpanned the Pegasus, only just able to contain her annoyance. “She made a shield of light. We can't touch her."

"So...... what are we going to do?"

Twilight looked around the library and brought back a pair of really old-fashioned sunglasses and a book. She sat down on the floor, getting herself as comfortable as possible, and passed Dash one of the glasses. She glanced at the bubble only to see that Starlight was still in tears. The unicorn opened her book and sighed heavily. "We'll just have to wait and see."